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dnl FC_CHECK_X_LIB(LIBRARY, FUNCTION [, ACTION-IF-FOUND [,
dnl ACTION-IF-NOT-FOUND]])
dnl
dnl This macro is intended to search for X11-related libraries. It takes the
dnl following variables for input:
dnl X_LIBS -- prefixed to all linker lines
dnl X_EXTRA_LIBS -- suffixed to all linker lines
dnl LIBS -- suffixed to all linker lines (after X_EXTRA_LIBS)
dnl Thus, the trial linker line will be "$X_LIBS -l$1 $X_EXTRA_LIBS $LIBS".
dnl
dnl The following variables are output:
dnl X_EXTRA_LIBS -- contains "-l$1 $X_EXTRA_LIBS" if the link succeeds
dnl
dnl Thus, the intended usage of this macro is something like this:
dnl AC_PATH_XTRA
dnl X_LIBS="$X_LIBS $X_PRE_LIBS"
dnl dnl Is it just me or is AC_PATH_XTRA broken?
dnl FC_CHECK_X_LIB(X11, XOpenDisplay, , AC_MSG_ERROR("Need X11"))
dnl FC_CHECK_X_LIB(Xext, XShapeCombineMask)
dnl [etc.]
dnl LIBS="$X_LIBS $X_EXTRA_LIBS $LIBS"
dnl
AC_DEFUN(FC_CHECK_X_LIB,
[AC_MSG_CHECKING([for $2 in X library -l$1])
dnl Use a cache variable name containing both the library and function name,
dnl because the test really is for library $1 defining function $2, not
dnl just for library $1. Separate tests with the same $1 and different $2s
dnl may have different results.
ac_lib_var=`echo $1['_']$2 | sed 'y%./+-%__p_%'`
AC_CACHE_VAL(ac_cv_lib_$ac_lib_var,
[ac_save_LIBS="$LIBS"
LIBS="$X_LIBS -l$1 $X_EXTRA_LIBS $LIBS"
AC_TRY_LINK(dnl
ifelse([$2], [main], , dnl Avoid conflicting decl of main.
[/* Override any gcc2 internal prototype to avoid an error. */
]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
extern "C"
#endif
])dnl
[/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char $2();
]),
[$2()],
eval "ac_cv_lib_$ac_lib_var=yes",
eval "ac_cv_lib_$ac_lib_var=no")
LIBS="$ac_save_LIBS"
])dnl
if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
AC_MSG_RESULT(yes)
ifelse([$3], ,
[changequote(, )dnl
ac_tr_lib=HAVE_LIB`echo $1 | sed -e 's/[^a-zA-Z0-9_]/_/g' \
-e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
changequote([, ])dnl
AC_DEFINE_UNQUOTED($ac_tr_lib)
X_EXTRA_LIBS="-l$1 $X_EXTRA_LIBS"
], [$3])
else
AC_MSG_RESULT(no)
ifelse([$4], , , [$4
])dnl
fi
])
. I am not sure how it works...Except that it doesn't cause autoconf 2.50 won't eat it. It is possible that the bug is in autoconf, but I doubt it!
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